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Package Includes:2pcs 42mm Diamond hole saw, Diamond-coated hole saw, suitable for drilling holes in glass, marble, pocelain, fiberglass, slate, light stone, ceramic tiles or graniteRustless & Durable: This diamond drill bits are made of high strength Carbon Steel with smooth nickel plating surface to extend the service life.Quick, Sharp & Smooth Cut: Each diamond hole saw was coated with high quality Diamond to enhance the drilling speed and creates a sharp, high precision and smooth cut with no broken edges In Seconds. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.Widely Application: Drilling holes for Glass, Tile Bottles, Blocks Jars, Fiber Glass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone (especially for glass AND tile). Not for use on Concrete or for depths beyond about 1/2". Will work with all electric drills.